SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93302b93e5b69a1d6fa46b59fdfbf46a0f24885a3401ae580481000e791d440c' 
  AND token = '7aweNUHKPn5mJnQKfv1jr1q69xklZ6fW7sAFcMylXqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}